If you mean Carillon (Romero) disks like Strict Tempo and Shades of Green then bank C is silence as I described in my first post and can be seen in the screen by the sliders being zeroed. Similarly Style Disk Warehouse (Blake) disks Music To Watch Girls Go By have some files with panel memories 5 to 8 with the right hand voices and apc muted in the screen, although here left and root bass and chord will still sound, but the principle is exactly the same as I first described.